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This zone was renamed in 1983 [3] to Hawaii–Aleutian Standard Time when the majority of Alaska was moved out of the zone. Prior to 1983, the current Alaska Time Zone (UTC−09:00) was known as the Yukon Time Zone, observing Yukon Standard Time (YST). This time zone included Canada's Yukon Territory and a small portion of Alaska including Yakutat.
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
The Uniform Time Act introduced Daylight Saving Time uniformly in the United States, which Alaska would begin observing on April 28, 1968. [12] [13] The Uniform Time Act also defined four time zones that Alaska would use: [14] Bering Standard Time (UTC−11:00), used by the west coast (including Nome) and the Aleutian Islands. [15] [16]
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone. However, some states are in two time zones, due to ...
Standard time in the contiguous United States, illustration 1903. From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley.
Time zones in Canada . Standard DST Time zone ; ... and with Alberta and Alaska. [33] The latest United States change ... Map CA +4734−05243 ...
This standard was known as New Zealand Mean Time. [10] 1913 time zone map of the United States, showing boundaries very different from today. Timekeeping on North American railroads in the 19th century was complex. Each railroad used its own standard time, usually based on the local time of its headquarters or most important terminus, and the ...